noun--The large collections of photos, fliers,
help-wanted signs, and other miscellaneous notifications (two-month-old
yard-sale signs, "have you
seen our
kitty?" signs, "Bill's mulch and mechanic service" signs, etc) pasted to telephone poles and notification boards around cities and in some small towns.
Similar to graffiti in the sense that they can not be ignored, and sometimes, they are either a complete eyesore or mysteriously artistic.
Also: a collage with several contributors, or a publicly posted photo thereof.